


Analyze how PHP uses the ob cache mechanism to implement page static solutions
Pre-converting the PHP execution page into HTML is one of the so-called PHP static methods.
Other methods include template replacement, opcache and other methods.
The role of staticization:
Improve the response speed of the website and reduce the load of the server;
Used for search engine SEO;
Use PHP output buffer to write directly into html, timing Scanning the website regularly in the background is a relatively easy way to achieve static web pages.
Before staticization:
for($i=0;$i<1000;$i++){
echo "bull
";
}
?>
Static:
ob_start();
for($i=0;$i<1000;$i++){
echo "bull< ;br>";
}
$str = ob_get_contents();
ob_end_clean();
$fp = fopen("test.html ","w");
fwrite($fp,$str);
fclose($fp);
echo "
?>
This code will pre-form a test.html. To put it bluntly, it is actually using space in exchange for Time, like news websites, the published content will basically not change after it is written, so it is more suitable to statically convert it into HTML.
When users visit, they just need to direct to this html page.
#First introduce some common functions commonly used in ob cache in php
ob_start(): open Caching mechanismob_get_contents(): Get the contents of the ob cacheob_clean() Clear the contents of the ob cache, but do not close the cacheob_end_clean() Clear the ob cache content in the cache, and close the cacheob_flush Clear the cache, output the content, but do not close the cacheob_end_flush Clear the cache, output the content, and close the cacheflush forces the output to be refreshed Content in the cacheAccording to the provisions of the http protocol, the response content cannot be output before the response header. Therefore, if there is content output in front of the header() function, an error will occur, but after using ob_start() The response content will be placed in the ob cache first and will not be sent before the message header is sent. This solves the problem of header() error reporting!Let’s talk about how to use PHP’s own ob cache mechanism to achieve page staticization
1 <?php 2 3 $id=$_REQUEST['id']; 4 5 //判断缓存文件是否存在,如果存在,直接输出 6 if(file_exists('content'.$id.'.html')){ 7 echo file_get_contents('content'.$id.'.html'); 8 return; 9 }10 11 //开启缓存机制12 ob_start();13 14 //到数据库中查询所需要的内容15 $conn=mysql_connect("localhost","root","root");16 mysql_select('db');17 mysql_query('set names utf8');18 19 $sql="select content from table_name where id=$id";20 $res=mysql_query($sql);21 $row=mysql_fetch_assoc($res);22 $content=$row[0];23 24 mysql_free_result($res);25 mysql_close($conn);26 echo $content;27 //将输出的内容保存到文件中,形成静态页面,在下次访问的时候,直接读取输出28 file_put_contents('content'.$id.'.html',ob_get_contents());29 30 31 ?>
The above is the detailed content of Analyze how PHP uses the ob cache mechanism to implement page static solutions. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
